But what I hate the most is the "not knowing..." are they any bad frames in my render? You don't know until after . At least with a crash you *know* something is wrong. And for some slow complex scripts you have to redo the whole adventure (or at least parts of it and join if doing a lossless pass). You end up spending way more time than if you ran it safely in single threaded mode.

It's not worth it IMO, just leave a computer to do it single threaded overnight

(And yet some people swear it's ok for everything... ... I call BS on that)